A rubber composition for golf balls includes (a) a base rubber, (b) a co-crosslinking agent which is an ,-unsaturated carboxylic acid and/or a metal salt thereof, (c) an organic peroxide, (d) water or an alcohol, and (e) an antioxidant which is a benzoimidazole of the following general formula and/or a metal salt thereof. When the rubber composition is used in constituent members of a golf ball, especially the core, the golf ball exhibits low spin properties on shots, resulting in an improved flight performance and enabling a good durability to be maintained.

In a golf ball having a core of at least one layer and a paint film of at least one layer, at least one layer of the paint film includes delustering particles and the same or a differing layer of the paint film includes an effect pigment. The ball is a matte golf ball that is free of luster and gloss and moreover has a quality look.

To provide a golf ball that can prevent considerable decrease in carry distance of a driver shot when it rains and also can more reliably prevent adhesion of dirt, etc. to the surface of the golf ball. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and has dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90 or more and a dynamic contact angle of 85 or less. The golf ball may have a dynamic friction coefficient of 0.48 or less. The cover may be formed of a material having hardness of 48 or more in terms of Shore D Hardness. The outermost layer may be formed of a urethane coating containing a water repellent additive, as a main component.

Golf balls are disclosed that include a centerline axis; an aperture located within the centerline axis; and a kinetic projectile located within the aperture. The kinetic projectile may consist of a hammer actuated .22 caliber single shot load or .27 caliber single shot load. The aperture may, optionally, further include an amount of black powder disposed therein. The golf balls are configured to launch farther and/or produce a striking sound greater than conventional golf ballswhen the balls are struck on the backside of the kinetic projectile disposed within the aperture of the golf balls.

Golf balls according to the present invention achieve flight symmetry and overall satisfactory flight performance due to a dimple surface volume ratio that is equivalent between opposing hemispheres despite the use of different dimple geometries, different dimple arrangements, and/or different dimple counts on the opposing hemispheres.

A golf ball with a core comprising polybutadiene and graphene is disclosed herein. The golf ball has a single core comprising polybutadiene and graphene. Alternatively, the golf ball has a dual core with an inner core comprising polybutadiene and graphene. Alternatively, the golf ball has a dual core with an outer core comprising polybutadiene and graphene.

Golf balls having covers made of thermoplastic polyurethane compositions are provided. Multi-piece golf balls can be made. Polyurethane primer coatings and polyurethane top-coatings are applied to the thermoplastic polyurethane cover. Isocyanate-rich and polyol-rich polyurethane coatings can be applied. In one embodiment, multi-functional imine and amine compounds can be used to treat the golf ball. The resulting coating may contain polyurethanes, polyureas, and hybrids, copolymers, and blends thereof. The cover composition and surface coatings can further include catalysts, ultraviolt (UV)-light stabilizers, and other additives. Heat is used to cure the coatings. The coating methods have many benefits and the finished balls have good physical properties.

The present invention provides golf balls having a non-straight flight trajectory due, at least in part, to a dimple pattern wherein the dimples on the opposing sides of the ball have at least one design feature that is different.

A golf ball sorting system has a ball feeder configured to transport a plurality of golf balls. At least some of the golf balls have a conductive marking pattern that is not visible to an observer because the marking pattern is covered by at least one other layer of the golf ball. A detection system receives the golf balls, inspects the golf balls, and outputs a detection result. A sorting system receives the detection result and sorts the plurality of golf balls based on the detection result to separate the plurality of golf balls into at least three groups, including a first category of golf balls that do not have the marking pattern, a second category of golf balls that have a first type of the marking pattern, and a third category of golf balls that have a second type of the marking pattern.

To provide a golf ball that can prevent a decrease in carry distance of a driver shot when it rains and also, can exert excellent spinning performance upon an approach shot. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and has dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90 or more, the golf ball having a dynamic friction coefficient of 0.52 or more. The cover may be formed of thermoplastic polyurethane having hardness of 55 or more in terms of Shore D Hardness. The outermost layer may be formed of a urethane coating containing a water repellent additive, as a main component.